Circuit Description
The remote control door lock receiver (RCDLR) communicates with the body control module (BCM) through the keyless entry serial data circuit. When any button on the keyless entry transmitter is pressed, the transmitter sends a signal to the RCDLR. The RCDLR sends a lock, unlock, rear release, or panic alarm request to the BCM, depending on which button is pressed on the transmitter. The BCM receives the message and performs the appropriate function. The BCM also uses the keyless entry serial data circuit in order to communicate with the RCDLR when programming transmitters.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B3102 Keyless Entry Data Link Circuit Low
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The system voltage is at least 9 volts and no more than 16 volts. |
Conditions for Setting the DTC
| • | The keyless entry serial data circuit is shorted to ground. |
| • | The above conditions must be met for approximately 300 milliseconds. |
Action Taken When the DTC Sets
The keyless entry system will not operate.
Conditions for Clearing the DTC
| • | A current DTC will clear when the fault is no longer present and the ignition switch is cycled. |
| • | A history DTC will clear after 100 consecutive ignition cycles without a fault present. |
| • | A scan tool may be used to clear history and current DTCs. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Keyless Entry Schematics | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Is the DTC B3102 a current code? | -- | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
Does the DMM indicate the specified value? | B+ | Go to Step 5 | Go to Step 4 | |
4 | Test the keyless entry serial data circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 6 |
5 | Inspect for poor connections at the harness connector of the RCDLR. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 7 |
6 | Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 8 |
7 | Replace the RCDLR. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 9 | -- |
8 | Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 9 | -- |
9 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
